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Issue 37, 2018, Issue in Progress
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Synthesis and characterization of nanostructured MnO2–CoO and its relevance as an opto-electronic humidity sensing device

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Abstract

Metal carboxylates are widely used in science and technology and have been the subject of intense studies due to the practical importance of their products. The present paper reports the synthesis of MnO2–CoO using metal carboxylates as precursors and the effect of humidity on the transmitted power through its thin film at room temperature. The refractive index of the material was found to be 1.445930 and the peak obtained from the photoluminescence spectra lies in the visible region. TEM reported a minimum grain size of ∼5.7 nm and SAED confirmed the crystalline nature of the material, which was further confirmed by XRD. Fluorescence characteristics also confirmed the low dimensionality of the material. The film was then investigated using SEM which exhibited the porous morphology. Through UV-Vis spectroscopy, it was found that the absorption of the film takes place in the UV region and the optical band-gap was observed to be 3.849 eV from the Tauc plot. The film was employed as a transmission based opto-electronic humidity sensor. Average sensitivity was found to be ∼2.225 μW/% RH with response and recovery times of 47 s and 59 s respectively. Experiments were repeated and the reproducibility of result was found to be ∼89%.

Graphical abstract: Synthesis and characterization of nanostructured MnO2–CoO and its relevance as an opto-electronic humidity sensing device

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Supplementary files

Article information


Submitted
06 Mar 2018
Accepted
15 May 2018
First published
05 Jun 2018

This article is Open Access

RSC Adv., 2018,8, 20534-20542
Article type
Paper

Synthesis and characterization of nanostructured MnO2–CoO and its relevance as an opto-electronic humidity sensing device

S. Sikarwar, B. C. Yadav, G. I. Dzhardimalieva, N. D. Golubeva and P. Srivastava, RSC Adv., 2018, 8, 20534
DOI: 10.1039/C8RA01975D

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